NITRATION PROCESS FOR PRODUCTION OF NITROGEN FERTILIZERS WITH IMPROVED LIME REMOVAL Russian patent published in 2024 - IPC C05B11/06 C05C5/04 C05C1/00 C05G1/00 

FIELD: agriculture.

SUBSTANCE: method of nitration process for production of nitrogen fertilizers includes the following stages: a) acidification of phosphorites with a solution of nitric acid to obtain an acidified solution, b) cooling the acidified solution obtained at step (a) to a temperature at which crystallisation of calcium nitrate occurs, c) neutralizing, if necessary, the reaction mixture obtained at step (b) with ammonia to obtain a mixture of ammonium phosphate, calcium phosphate and ammonium nitrate, d) conversion of calcium nitrate obtained in step (b) into ammonium nitrate and calcium carbonate using carbon dioxide and ammonia, e) separating calcium carbonate from ammonium nitrate in settling vessel (100), wherein at step (e), a flocculant is added to settling vessel (100) to improve precipitation of calcium carbonate in settling vessel (100).

EFFECT: invention enables to efficiently and completely remove CaCO₃ from NH₄NO₃.

14 cl, 3 dwg, 1 tbl, 20 ex